[jira] [Updated] (CASSANDRA-9168) Allow single-shot tracing on an active node

["C. Scott Andreas (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-9168?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

C. Scott Andreas updated CASSANDRA-9168:
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    Component/s: Observability

> Allow single-shot tracing on an active node
> -------------------------------------------
>
>                 Key: CASSANDRA-9168
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9168
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Observability
>            Reporter: Jonathan Shook
>            Priority: Minor
>
> It would be useful to be able to ask a node for a single trace, or possibly even a few, without having to use traceprobability.  This might allow more users to benefit from the clarity that tracing can provide without having to worry about accidentally setting the probability too high or leaving it on too long.
> This would be a simple JMX operation representing a single request for a trace, with everything else working as settraceprobability does presently.
> Optionally, an argument could be provided which represents a request for N traces, with a default minimum interval between them of 5.0 seconds. If a second parameter were provided, it would work as an override to the minimum interval in fractional seconds.
> Another form of the command would allow a user to specify a keyspace and table to trace. While this might add overhead, it could be implemented in such a way that the overhead is almost non-existent except when there are traces queued, and minimal even then.
> Ideally a user would be able to find the traces collected in this way. This could be implemented in the trace logic as a simple list of sessions which were flagged for tracing. If this data were available via JMX, then nodetool as well as other operational tools would be able to provide an interactive mode of studying traces, even on an active system.
> While it may still be possible to submit an unreasonable trace request to a system under load, this form would be much less ominous for casual use on active systems.



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